Synthetic resin bobbin

ABSTRACT

A synthetic resin bobbin comprising at least one contractable wall constituting a desired portion of peripheral side wall of a tubular synthetic resin bobbin main body. The contractable wall is composed of a plurality of connecting members bent in a Vshaped or inverted V-shaped form and arranged vertically along the vertical wall of the main body. When the bobbin is subjected to pressure due to the shrinkage of yarn wound thereon, the connecting members are elastically contracted at their bent portions to contract the contractable wall.

United States Patent 1191 Hattori 1 Dec. 11, 1973 [5 SYNTHETIC RESIN BOBBIN 3,563,491 2/1971 Hahm et al. 68/198 x [76] Inventor: Soichiro Hattori, 444-4 FOREIGN PATENTS OR APPLICATIONS Shimoshibutani, Ikeda. Japan 6,812,518 3/1970 Netherlands 242/1182 [22] Filed: Mar. 3, 1972 Primary Exam1ner-Harvey C. l-lo'rnsby pp 231,624 Assistant ExaminerPhilip R. Coe

Attorney-J. Y. Houghton et al.

[30] Foreign Application Priority Data Mar. 9, 1971 Japan 46/12629 [57] P June 5, 1971 Japan 46/39544 A Synthetic 165m 1 9 15 at least one 9 tractable wall constrtutmg a deslred portion of penph- 52 US. Cl. 68/198 ml side wall of a tubular synthetic resin bobbin min 51 1111. C1 B65h 75/22 body- The jwntractable wall i composed of a plurality [58] Field of Search 68/189, 198; of connecting members hem a Y- p mveftefl 242/1131, 11331, 1182 V-shaped form and arranged vertmally along the vertical wall of the main body. When the bobbin is sub- 5 References Cited jected to pressure due to the shrinkage of yarn wound UNn-ED STATES PATENTS thereon, the connecting members are elastlcally con- 3 465 984 9/1969 t 1 242/118 H tracted at their bent portions to contract the contract- 1gges e a 2,117,902 5/1938 Moyer 68/198 able 3,561,696 2/1971 Hahm 242/118.11 6 Claims, 9 Drawing Figures PAIENIEBuEcImB 3,777,515

- samzurs l a g www t svnrnsrrc snsnv sossrn The present invention relates to synthetic resin bobbins, more particularly to improvements in a synthetic resin bobbin to be used mainly for bleaching or dyeing a yarn with the yarn wound thereon.

When a so-called cheese consisting of .a bobbin with yarn wound thereon is bleached or dyed, the yarn shrinks due to the action of the treating liquor,pressing the bobbin with a considerable force. In such case, the bobbin fails to withstand the pressure and tends to collapse if it is fragile, whereas if tough and strong, the bobbin will not permit the yarn to shrink, causing the yarn to be broken off. Thus in either case, satisfactory bleaching or dyeing treatment will not be effected.

A principal object of this invention is to provide a synthetic resin bobbin which can be readily contracted to the desired extent in the diametrical directions thereof when subjected to pressure caused by the shrinkage of yarn during bleaching or dyeing of the cheese so that the bobbin and the yarn thereon can be prevented from any possible breakage.

Another object of this invention is to provide a synthetic resin bobbin wherein the extent of the diametrical contraction of the bobbin due to the shrinkage of yarn is suitably controlled in accordance with the strength of the yarn or the degree of shrinkage of the yarn so as to fulfil the above-mentioned object with greater reliability.

The synthetic resin bobbin according to this invention comprises at least one contractable wall constituting a desired portion of peripheral side wall of a tubular synthetic resin bobbin main body, the contractable wall being composed of a plurality of connecting members bent in a V-shaped or inverted V-shaped form and arranged vertically along the vertical wall of the main body, whereby the connecting members can be elastically contracted at their bent portions to contract the contractable wall when the bobbin is subjected to pressure due to the shrinkage of yarn wound thereon.

Accordingly, when the yarn wound on the bobbin of this invention shrinks during bleaching or dyeing, the resulting compressive pressure acting on the bobbin will cause the connecting members to bend elastically, thereby contracting the contractable wall to reduce the diameter of the entire bobbin. Thus even when the bobbin is relatively low in toughness and the yarn exhibits high shrinkage, the pressure resulting from the shrinkage of yarn will not collapse the bobbin, whereas if the yarn to be treated has low strength it is assured that the yarn will not be broken off. The yarn therefore can be bleached or dyed as desired and more rationally and satisfactorily than heretofore possible.

Further in accordance with this invention, it is possible to suitably alter or determine the number of the contractable wall or the number of the connecting member per se constituting the contractable wall, the thickness of the connecting member and the bending angle of the connecting member so as to control as desired the extent to which the bobbin is contractable depending on the strength and shrinkability of the yarn and to thereby assure bleaching or dyeing under optimum conditions all the time.

For a better understanding of the present invention, the invention will hereinafter be described with reference to accompanying drawings showing embodiments,

wherein:

FIG. l is a front view of a synthetic resin bobbin according to this invention;

FIG. 2 is a view in cross section taken along the line II-II in FIG. I;

FIH. 3 is a view illustrating how the bobbin is con tracted and deformed;

FIG. 4 is a front view of another embodiment of synthetic resin bobbin according to this invention;

FIG. 5 is a view in cross section taken along the line III-III in FIG. 4;

FIG. 6 is a view illustrating how the bobbin is contracted and deformed; and

FIGS. 7 to 9 are fragmentary views illustrating connecting members in different shapes respectively.

The synthetic resin bobbin of this invention shown in FIGS. 1 to 3 is integrally molded of polypropylene resin with a mold. The bobbin is in the form of a tube having a uniform diameter and comprises a plurality of vertical walls 1 having a small width and equidistantly spaced apart in circumferential arrangement and a plurality of contractable walls 3 including a great number of connecting members 2 bent in an inverted ll-shaped form and extending between the vertical walls l and l in vertical arrangement. The connecting member 2 is smaller in its thickness and width at its top end than at its base portion which is integral with the vertical wall I. This construction assures bending and elastic contraction of the connecting member when it is subjected to pressure, facilitating diametrical contraction of the bobbin.

With the synthetic resin bobbin embodying this invention in the foregoing manner, when the yarn on the bobbin shrinks during bleaching or dyeing to exert pressure on the bobbin, the respective connecting members 2 are elastically contracted at their bent portions to reduce the diameter of the: bobbin as illustrated in FIG. 3, so that breakage of the bobbin as well as the yarn can be prevented and bleaching or dyeing treatment can be carried out satisfactorily as intended. Since the peripheral side wall of the bobbin of this embodiment is predominantly composed of the contractable walls 3, the pressure on the bobbin due to the shrinkage of yarn thereon results in a marked reduction in the diameter of the bobbin. The bobbin is therefore suitable for bleaching and dyeing of yarns having a high order of shrinkage. Further in accordance with this embodiment, the treating liquor will pass through the bobbin smoothly by way of a great number of apertures4 defined by the vertical walls l and connecting members 2, with the resulting advantage that bleaching or dyeing treatment can be conducted as desired without any need to form passages for the treating liquor in the peripheral wall of the bobbin.

FIGS. d to a show a modified synthetic resin bobbin of this invention. In accordance with this embodiment, the bobbin is formed in its peripheral wall with a great number of apertures 113 for passing the treating liquor which are defined by a plurality of narrow vertical walls 11 and a plurality of horizontal walls 12 having a small width. At two opposite portions of peripheral wall of the bobbin, a great number of connecting members 14 bent in an inverted if-shaped form are provided along the vertical walls It in vertical arrangement to form two contractable walls IS in the bobbin in opposing relation to each other. Since this embodiment includes only two contractable walls 115, the bobbin itself has a higher strength, while it undergoes relatively small diametrical reduction when subjected to the pressure of shrinking yarn. Thus this bobbin is fit for bleaching or dyeing of yarns having low shrinkage.

In accordance with this invention, the shape and construction of the contractable wall of the bobbin may be versatile. As shown in FIG. 7, for example, V-shaped connecting members 22 and inverted V-shaped connecting members 23 may be arranged alternately between the vertical walls 21 and 21, or as shown in FIG. 8, a synthetic resin slender rod 33 for reinforcement may be provided to connect the bent portions of inverted V-shaped connecting members 32 disposed between vertical walls 31 and 31. Further as shown in FIG. 9, an inverted V-shaped steel wire spring 43 may be embedded in some or all of inverted V-shaped connecting members 42 positioned between vertical walls 41 and 41 of a bobbin to enable the bobbin to be restored to the original form more readily after contraction.

Although the bobbins of the foregoing embodiments are in the form of a tube having a uniform diameter, the contractable wall described above can of course be formed in a tubular bobbin having a truncated conical shape.

It should be understood that the principal embodiments of the present invention above are given for illustrative purposes only and that the invention is not limited thereto. Various other modifications may be made by those skilled in the art within the scope of this invention insofar as they do not depart from the scope of the claims appended hereto.

What is claimed is:

1. A synthetic resin tubular bobbin comprising at least one axially extending, circumferentially contractable wall constituting a desired portion of the axially extending side wall of a tubular synthetic resin bobbin main body, said contractable wall comprising a plurality of connecting members bent in an inclined direction axially to form a bent portion, said bent portion arranged in axially spaced relationship along the axially extending side wall of the said main body, and slender, axially extending rod means connecting the bent portion of each of said axially spaced, connecting members to one another wherebythe connecting members can be elastically contracted at their bent portions to circumferentially contract the contractable wall when the bobbin is subjected to pressure due to the shrinkage of yarn wound thereon.

2. The synthetic resin bobbin as set forth in claim 1 wherein said bobbin includes a plurality of the contractable walls circumferentially spaced in the axially extending side wall of the bobbin main body.

3. The synthetic resin bobbin as set forth in claim 1 wherein the axially extending side wall of the bobbin main body consists only of a plurality of alternating axially extending and contractable walls.

4. The synthetic resin bobbin as set forth in claim 1 wherein circumferentially extending steel wire spring means are embedded in the said connecting members.

5. A synthetic resin bobbin as set forth in claim 1 wherein the bent portion is V-shaped in configuration.

6. A synthetic resin bobbin as set forth in claim 1 wherein the bent portion has an inverted V-shaped configuration. 

1. A synthetic resin tubular bobbin comprising at least one axially extending, circumferentially contractable wall constituting a desired portion of the axially extending side wall of a tubular synthetic resin bobbin main body, said contractable wall comprising a plurality of connecting members bent in an inclined direction axially to form a bent portion, said bent portion arranged in axially spaced relationship along the axially extending side wall of the said main body, and slender, axially extending rod means connecting the bent portion of each of said axially spaced, connecting members to one another whereby the connecting members can be elastically contracted at their bent portions to circumferentially contract the contractable wall when the bobbin is subjected to pressure due to the shrinkage of yarn wound thereon.
 2. The synthetic resin bobbin as set forth in claim 1 wherein said bobbin includes a plurality of the contractable walls circumferentially spaced in the axially extending side wall of the bobbin main body.
 3. The synthetic resin bobbin as set forth in claim 1 wherein the axially extending side wall of the bobbin main body consists only of a plurality of alternating axially extending and contractable walls.
 4. The synthetic resin bobbin as set forth in claim 1 wherein circumferentially extending steel wire spring means are embedded in the said connecting members.
 5. A synthetic resin bobbin as set forth in claim 1 wherein the bent portion is V-shaped in configuration.
 6. A synthetic resin bobbin as set forth in claim 1 wherein the bent portion has an inverted V-shaped configuration. 